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Since the dawn of modern warfare, the best way to stay alive in the face of incoming fire has been to take cover behind a wall. But thanks to a game-changing "revolutionary" rifle, the U.S. Army has made that tactic dead on arrival. Now the enemy can run, but he can't hide.

After years of development, the U.S. Army has unleashed a new weapon in Afghanistan -- the XM25 Counter Defilade Target Engagement System, a high-tech rifle that can be programmed so that its 25-mm. ammunition does not necessarily explode on impact. Instead, it can be set to detonate either in front of or behind a target, meaning it literally will go through a wall before it explodes and kills the enemy.

It also has a range of roughly 2,300 feet -- nearly the length of eight football fields -- making it possible to fire at targets well past the range of the rifles and carbines that most soldiers carry today.

Lt. Col. Christopher Lehner, project manager for the semi-automatic, shoulder-fired weapon system for the U.S. Army's Program Executive Office Soldier, said that the XM25's capability alone is such a "game-changer" that it'll lead to new ways of fighting on the battlefield, beginning this month in Afghanistan.

"With this weapon system, we take away cover from [enemy targets] forever," Lehner told FoxNews.com on Wednesday. "Tactics are going to have to be rewritten. The only thing we can see [enemies] being able to do is run away."